Cementation pattern and genetic implications of Holocene beachrock
from northeastern Brazil.
Overall, heavy metals loads in coastal sediments of Chania Prefecture were found satisfactory, with reference samples (e.g., beachrock
) and their measured values being comparable to the ones measured in a similar coastal environment in Izmit Bay, Turkey .
Indeed, evidence of pre-2600 year ago occupation is limited to scattered shells of possible cultural origin cemented within beachrock
at Sokoli on Dauar which have been radiocarbon dated to 3060[+ or -]60 BP (2800 years ago) and 3150[+ or -]70 BP (2850 years ago) (Carter 2004: 153).
Aragonite-cemented sandstone from outer continental shelf off Delaware Bay: submarine lithification mechanism yields product resembling beachrock
To determine grain size distribution, cores (8 cm in diameter) of sediment were taken adjacent to sponges, from the surface down to the beachrock
. Particles were differentiated by size, dried at 80[degrees]C for 24 h, and weighed.
Other well-known examples in the region are beachrock
or limestone slabs used for chiefly backrests, fortifications, and tomb enclosures in Tonga (Burley, 1993; Burley, 1998; Kirch, 2000; McKern, 1929), the stone faces of Palau (Osborne 1979:161; 174-176), latte stones in the Marianas (Russell 1998), basalt columns and boulders in both Pohnpei (Ayres and Scheller 2001) and Kosrae (Athens, 1990; Athens, 1995; Rainbird, 1995), and the stone money disks of Yap (Fitzpatrick, 2002, 2003a; Fitzpatrick and Diveley, 2004).
Layer V (>150 cm) was coarse yellowish sand with beachrock
, yielding no cultural material.
At two localities (GPS N24.56061 E 54.56568) along the southern edge of the two metre platform Holocene(?) beachrocks
displaying fenestral pores and containing mollusc shells are exposed (Fig.